Instantaneous particle flow rate can not be measured accurately and easily in an instantaneous whole field by the conventional method when the flow rate is high. However, there are lots of requirements for the whole field measurement of particle flow rate in various industrial processes. the purpose of this research is to develop a new measuring method for the particle flow rate by using PIV (Particle Imaging Velocimetry). This paper proposes new two types of counting methods, the Control Surface Method and the Control Volume Method. In our experiment, images of the falling particles, which fall in air through a hopper, are taken by a high-speed video camera, and the particle flow rate crossing a plane is analyzed by the consecutive pictures. Particle velocity maps are also obtained by the PIV based on the binary image cross-correlation method (BICC). The performance of the two measurement methods for counting particle flow rate is investigated and discussed. A furthermore research, circular contour recognition method for high particle number density, is also described and applied to separate overlapped particle images.
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